Stuck together 3

She gave me that sad look. Her face pleading with all the feminine charm she could muster in her drunken state. I hate it when she does that.

"OK, I will do it but if we fall on our asses it's your fault," I told her walking over to the bed to investigate the costume more closely.

"Look sis, there is no way I am going to stay hunched over like that," I told her. "If I do this I will take the back of the costume and wag the tail."

"Fair enough," she accepted as she unzipped the back of the costume. The she stood back up and began to strip her clothes off in front of me. I looked at her in shock.

"What the hell are you doing?" I asked her.

"It's no big deal I have my bikini on under my clothes" she told me, "Don't be such a prude. You're a married man, it's not like you haven't seen a woman in a bathing suit before."

As she pulled off her dress I could see that her bikini had just barely enough fabric to carry the name. I guess it could have been worse. It had a high cut bottom that tied with short strings on the sides. Thank goodness she was not wearing her thong!

"OK, Strip," she instructed me.

"What? Are you crazy? I am your number stepbrother," I said with a shake in my voice. It was bad enough that she was standing in front of me in next to nothing and that I was having a hard time banishing the dirty thoughts that came to mind seeing her nipples poke into the triangles of her suit.

"Look, I know you have your boxers on. You always do. That is no different than seeing you in a bathing suit. Besides it is so hot in this costume you will die if you don't get some clothes off," she reasoned.

Maybe it was from drinking too much or just not really giving a damn but I realized it was a losing argument. I had just told her I would do it and there was no way she would let me out of it now. I started undressing down to my boxers. She climbed in and put her feet through the first set of legs and then her arms. She had to hold on the wall as she leaned over to put her head in the dragons head. As she let go to put her arms in I almost fell over trying to get my legs in beside hers. I finally got all the way in and put my arms through the second set of holes to flap the wings up and down.

"How the hell do we zip this thing up?" I asked her.

"There is a string that comes through the mouth," she told me. "I can zip it up once you get all the way in."

"I am all the way in," I told her.

"NO... you have get closer to me it's a very tight fit."

I leaned forward till my crotch was pushed up against her ass. At that moment I felt the zipper being pulled up and it pushed me harder against her. We were in but I was pressed so tight against her I could feel her ass pressing against my cock.

"I don't think I can do this," I told her.

"Yes you can. Besides, I broke the string when I pulled the zipper closed, if we get out now it will ruin the costume. Come on lets give it a try," she pleaded.

I was just drunk enough to think, "What the hell?" and told her ok. Walking was just as hard as I thought it would be. We had to go very slowly to keep from falling. After a little while we got in step with each other and managed to say upright. It was fun in a way; though I could not see anything at all. There was almost no light from the back but a tiny bit drifting down from the head my sister was wearing.

She would reach out and hug her friends and I would flap the big wings popping them in peoples' faces, asses or whatever was in the way. The effect the teasing and the walking with my crotch pressed tightly against her ass was having on me caused my cock to twitch and grow. "No!" I thought to myself sternly, "I can not get a hard on with my cock pressed against my stepsister’s ass."

I tried to think of everything gross and disgusting in an effort to keep my cock from raising its head but between the teasing sexy voices I heard and my stepsister's ass going up and down as she walked, my cock rose and there is way no way I could stop it.

I knew she felt it but it did not seem to bother her. The more she walked the more her ass slipped up and down my cock. It was almost like being jacked off with a huge hand. We were getting so hot that sweat was running over both of us and it only acted like lubricant. I was getting more and more turned on and there was no way I could deny it. Ideas were rushing through my mind.

Was it the feeling of having my cock worked or the fact it was Donna ass that had me so turned on? It hurt my head to think about it and I wanted to just go with the feeling. I want to cum. I needed to cum. At times it seemed she would bend over further to hug someone and her ass cheeks would wrap my hard cock even harder.

We had been walking around about 15 minutes and we were both covered in sweat. The sweat was dripping down our bodies and my boxers were soaked. I was so into feeling my sister's ass rub up and down my hard cock that I was not even paying attention to anything around me. I was just lost in the lust of the moment.

It was then that I felt something different. In my fogged state it took a minute to realize what it was. My sister's bikini bottoms had come untied and were slipping down her leg. We walked maybe 6 more steps and they fell all the way off.

We both stopped walking and paused with realization at what had happened. She whispered back to me.

"Oops, sorry. I guess this is a problem, little brother," she said in a giggly laugh.

Now that her bikini bottoms were totally gone her ass really spread around my cock. The feeling increased ten fold as each step she took caused her ass to pull my cock up and down. I let out a moan as I felt her naked ass against me. She whispered back, "We need to get back to the room and fix this problem before things get messy."

She had no idea how messy things were going to get very soon if we did not get out of this thing. I could feel the blood leaving my brain and all I wanted was to cum hard and long. I was close to the point of not caring who I was with or who was around. I just wanted to cum. Her bare ass was so deep and tight that I could feel her cheeks pulling on my boxers as we walked. As she took one more step her ass pulled on my cock and I felt my cock spring out of the fly in my boxers.

"Oh shit..." was all I could manage to say as my cock pressed against her wet ass.

"I know I can feel it" she said in dreamily wispy voice.

"We have to get back to the room now and get out of the costume," she said. This time there was no laugh just a small quiver in her voice.

I only thought I was turned on before. Now I could feel her bare skin and the sweat from our bodies running between the crack of her ass. The whole inside of the costume smelled of sweat and there was no denying there was the smell of wet pussy.

The smell of her sex was more intoxicating than anything I could have ever imagined. I was getting more and more turned on. I knew in my brain that we had to get out of this soon, but all thought about consequences had totally left me. I was completely and totally lost in the moment.

My heart was racing and I could tell she was also starting to pant a little. Her breathing was short and fast and with each step she would let a little moan out. Getting back to her room was a nearly impossible task. We were way outside on the deck and it took 10 minutes for us to get that far. I knew it was going to be a slow walk back inside and to her room.

Slowly we walked back inside her house. Each step seemed to take and eternity. With each forward step my rock hard cock was slipping up and down her and I swear she was pushing her ass against me with each step. The temperature in the costume was rising and I was not sure it was all from the heat.

I whispered, "If we don't get back soon I am going to lose it... We have to try to go faster".

We picked up the pace and started taking bigger steps. This was a big mistake. With her first big step forward we got out of sync and she fell over toward the floor face first. I tried to lean back to keep us upright. Her falling forward and me falling back was just enough gap that my cock slipped from between her ass cheeks. As she caught herself from falling and pulled up, I felt a warm wetness engulf my hard throbbing cock.

She let out a moan and her whole body stiffened as a small quake rippled through her body. My mind was in a fog. I tried to pull back but there was no room. Her pussy squeezed my cock like a vice and her breathing quickened. Neither of us moved or said anything for several seconds. Soon her breathing slowed down but the warm wetness was still engulfing my hard cock.